Demonstration only. Corollary is a non-commercial research demo — no warranty, no support, not for commercial use or clinical decisions. Read the disclaimer

Corollary Labs
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Corollary vs K-Dense Web

K-Dense Web is a hosted AI co-scientist that turns analyses into reports, papers, slides and posters, on paid plans for anything that runs code. Corollary is free for non-commercial research and runs 145 open scientific models and nf-core pipelines for you.

See them side by sideTry Corollary free

The short answer

K-Dense Web and Corollary are both hosted agents that write and run code on their own cloud, so the choice comes down to what each brings to the work and what it costs.

K-Dense leans towards the finished product: reports, manuscripts, slides and posters, on paid plans with commercial terms. Its free mode answers without running code. K-Dense also publishes an open-source library of scientific skills and a desktop app that run on your own agent and model keys.

Corollary leans towards the computation: open scientific models that need no GPU of your own, bioinformatics programs and nf-core pipelines on machines of its own, all on the free plan. It is a non-commercial research demonstration, so company work belongs elsewhere.

Side by side

What it is
CorollaryA research agent with a Linux machine of its own, and a library of open scientific models, programs, databases and pipelines it runs for you.
K-DenseK-Dense Web: a hosted AI co-scientist that writes and runs code and turns the work into reports, papers, slides and posters.[1]
How you use it
CorollaryIn the browser, with a free account or signed out. Nothing to install. Also a developer API and an MCP server.
K-DenseA web app with self-serve sign-up. Also an open-source skills library and a desktop app for your own agent.[2][6][7]
Price
CorollaryFree. 30,000 credits a month with an account, 1,000 signed out; database queries never use credits.
K-DenseCode-running work is paid: pay-as-you-go runs capped at $9 (Standard) or $29 (Pro); Plus at $199 a month; Team at $499 a month. The free Instant mode runs no code, and there are no starter credits.[3][2]
Commercial use
CorollaryNot permitted. Corollary is a non-commercial research demonstration, with no warranty or support.
K-DensePermitted, except on the discounted academic plan.[2]
Where the work runs
CorollaryOn our servers: a Linux machine per conversation, and jobs of up to 32 cores, 256 GiB of memory and 24 hours for long runs.
K-DenseOn K-Dense's cloud, hosted on Google Cloud. Runs can last hours, with the cost capped per run.[2][1]
Scientific AI models
Corollary301 models in the library, 145 of them run here — GPU included, with no setup and no key of your own.
K-DenseTrains and tunes machine-learning models on your data.[1]
Programs and pipelines
Corollary43 bioinformatics programs installed or run as jobs, and 143 nf-core pipelines.
K-Dense“Hundreds of thousands of on-demand tools”, and more than 200 data formats.[1]
Databases
Corollary53 public databases queried live, with no API key of your own.
K-DenseMore than 250 databases.[1]
Language model
CorollaryChosen and paid for by Corollary. No API key of your own.
K-DenseA mix of Google Gemini and Anthropic models.[5]
Open source
CorollaryNo. The service is closed source; the models, programs and pipelines it runs are open.
K-DenseThe product is closed. Its scientific skills library (MIT) and its bring-your-own-key desktop app are open source.[6][7]
Your files
CorollaryUploaded to our servers and kept in the conversation's workspace. Some of our processors are in the United States.
K-DenseHosted on Google Cloud, with uploads of up to 10 GB. No training on your uploads, inputs or outputs.[4][3]

K-Dense's column is from its own public pages, read on 24 October 2026; the numbers link to them below. Corollary's figures are counted from the platform itself and each one links to the page that lists them.

Where K-Dense is the better choice

  • Finished outputs: manuscripts, slides, posters and PDF reports, alongside the code and data.[1]
  • Commercial plans, and enterprise deployment in the cloud, a private cloud or on premises.[3]
  • Uploads of up to 10 GB.[4]
  • An open-source skills library and a desktop app that run on your own agent and model keys.[6][7]
  • Academic and non-profit labs get 90% off the annual Team plan.[3]

Where Corollary is the better choice

  • Code runs on the free plan: 30,000 credits a month with an account, 1,000 without one.
  • 145 open scientific models, structure prediction and protein design included, run here with no GPU of your own.
  • 143 nf-core pipelines, run as jobs on machines of their own.
  • Every model, program and database has a public page saying what it is, what it is for and its licence, so you can see what the agent reaches before you sign up.

Try the same work on Corollary

Ask in plain language. The agent works on a Linux machine of its own: it installs and runs what the job needs, keeps every file, and reads the results back with the numbers explained.

“Fold this sequence and tell me whether the prediction is trustworthy: MQIFVKTLTGKTITLEVEPSDTIENVKAKIQDKEGIPPDQQRLIFAGKQLEDGRTLSDYNIQKESTLHLVLRLRGG”“Find a dataset of protein–ligand binding affinities, show me its columns, and tell me the distribution of pKd values and how many entries have a resolved structure.”“Run the nf-core/rnaseq test profile and show me the MultiQC report.”
Open the research agent

Questions

Is Corollary a free alternative to K-Dense?

Corollary is free: 30,000 credits a month with an account, and database queries never use credits. It is a non-commercial research demonstration, so it is not an alternative for commercial work — for that, K-Dense or one of the other options below may be the right choice.

Is K-Dense free?

Partly. Its Instant mode is free but does not run code, and there are no starter credits; work that runs code is paid per run or by subscription. Corollary runs code, models and pipelines on its free plan.

What happened to claude-scientific-skills?

K-Dense renamed the repository scientific-agent-skills. It now works with several agent hosts, not only Claude, and runs wherever your agent runs — K-Dense hosts no compute for it.

Sources

  1. [1]K-Dense — K-Dense Web
  2. [2]K-Dense — FAQ
  3. [3]K-Dense — pricing
  4. [4]K-Dense — office hours recap (March 2026)
  5. [5]K-Dense — K-Dense Web vs Claude Science (16 July 2026)
  6. [6]scientific-agent-skills (GitHub)
  7. [7]k-dense-byok (GitHub)

Written by Corollary Labs, which makes Corollary — read it with that in mind. Everything said about K-Dense comes from the sources above as they read on 24 October 2026; products change, and if a line here is out of date, write to hello@corollary-labs.com and we will correct it. K-Dense and the other names here are trademarks of their owners, used only to identify their products. Corollary is a non-commercial research demonstrator. It is provided free of charge, without warranty or support, and must not be used for commercial purposes or relied upon for clinical, diagnostic, regulatory or safety-critical decisions.

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